Manhole frame and cover.



No. 636,20l.

Patented Oct. 3|, I899. T. P. GREGER. MANHOLE FRAME AND GDVEB.

(Application filed my 4, 1599.

2 Shasta-Sheet 1.

(N0 ModeL) we uunms vrrERs mmL ITHQ. WASNINGYON. n c.

No. 636,20l. Patehted Oct. 3|, I899.

T. P. G'REGER. MANHOLE FRAME AND COVER.

Animation fl1e d m 4, 1399. (No Model.) 2 Sheeta--Sheot .2'.

UNITED STATES FECE.

PATENT THOMAS RGREQER, PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE GREGER MANUFACTURING COMPANY, OF CAMDEN, NEW JERSEY.

MANHOLE FRAME AND COVER.

SPECIFICATION forming part of Letters IPatent No. 636,201, dated October 31, 1899.

Application filed May 4:, 1899. Serial No. 715,534. (No model.)

T to whmn it may concern:

Be it known that I, THOMAS P. GREGER, a citizen of the United States, residing at the city of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Manhole Frames and Covers,of which the following is a specification.

My invention has relation to a manhole frame and cover, and in such connection it relates to the construction and arrangement of the frame and cover.

The principal object of my invention is to provide a manhole frame and cover of simple construction, the frameand cover being so constructed and arranged as to admit of the change from a non-ventilating to a ventilating frame and cover or vice versa.

My invention, stated in general terms, consists of a manhole cover and frame constructed and arranged in-substantially the manner hereinafter described and claimed.

The nature and scope of my invention will be more fully understood from the following 2 5 description, taken in connection with the accompanying drawings, forming part hereof, in which- Figure 1 is a top or plan-view of a frame and cover embodying main features of my 0 invention, the cover being seated in the frame to form a non-ventilating frame and cover. Fig. 2 is a vertical sectional view on the line as 00 of Fig. 1. Fig. 3 is a similar view to that of Fig. 1, but with the cover shifted on its 5 seat to form, with the frame, a ventilating cover and frame for the manhole; and Fig. 4 is a vertical sectional view on the line y y of Fig. 3.

Referring to the drawings, or represents the 0 base of the frame, from which projects the u pwardly-extending wall I), having in its in terior the flange d, forming the seat for the cover 6 and extending under the base of said cover. The flange d is cut out at regular 5 points (1 to form semicircular and vertical recesses or openings in the seat or flange d. The periphery or rim of the cover e is also cut out so as to form oppositely-arranged semicircular recesses e', so that when required the cover e may rest on the seat or flange d, with the recesses or openings e registering with the recesses or openings d of the seat d, as

illustrated in Figs. 3 and 4. When, however,

the cover is shifted slightly on its seat, the openings 6 of the cover may be shifted to 5 5 come opposite the uncut portions of the flange or seat d, the cut-out portions (15 of said flange or seat at at the same time resting beneath the uncut portions of the rim of the cover e. The recesses e extend obliquely along the rim of 6c the cover.

To look the cover in the frame and to prevent its accidental displacement on the seat (1, as well as to serve as a guide in the turning of the cover on its seat, the inner periph-- cry of the wall I) is cut out or notched, as at b b in the upper edge or rim of the said wall, and into one of these notches a lug or projection 6 on the rim of the cover is adapted to engage. Thus, as illustrated in Figs. 1 and 7a 2, the projection e fits into the notch b and locks the cover so that the openings cl 6 are closed, while in Figs. 3 and 4 the lug or projection e fits into the notch 19 and locks the cover so that the openings d and e register. The cover may be provided with hand lifts or ringsf or other somewhat similar devices,

whereby it may be easily and quickly removed from the frame for the purpose of adj ustment or otherwise.

The cutting out of the rim of the cover 6 into semicircular recesses e,oppositely curved with respect to the recesses d of theledge d,

insures the complete covering of the base of said recesses e by the uncut portions of said ledge, which portions are corresponding in shape, but larger than the recesses e. The

construction and arrangement above described permits of the cutting out of both the rim of the cover as' well as the ledge d without impairing the strength of either the ledge or the cover.

Having thus described the nature and ob jectof my invention, what I claim as new, and desire to secure by Letters Patent, is 5 1. The combination with a frame having an upwardly-projecting wall, an annular flange or ledge formed on the interior of said wall,said ledge being provided with alternate recesses and projections, of a cover, the base whereof is adapted to rest upon the flange or ledge and having its rim provided at intervals with obliqely-arran ged recesses reversely arranged with respectto the recesses'ofthe ledge, and x5 means for locking the cover Within the frame to prevent the turning of the cover on said ledge, substantially as and for the purposes described.

In testimony whereof I have hereuntoset 20 my signature in the presence of two subscribing Witnesses.

THOMAS P. GREGER. -Witnesses:

J. WALTER DOUGLASS, THOMAS M. SMITH. 

